1281366242 has 16 divisors (see below), whose sum is σ = 2071624632. Its totient is φ = 590906880.

The previous prime is 1281366241. The next prime is 1281366253. The reversal of 1281366242 is 2426631821.

It can be written as a sum of positive squares in 4 ways, for example, as 916212361 + 365153881 = 30269^2 + 19109^2 .

It is a super-3 number, since 3×1281366242³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1281366241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12242 + ... + 52082.

Almost surely, 2^1281366242 is an apocalyptic number.

1281366242 is a deficient number, since it is larger than the sum of its proper divisors (790258390).

1281366242 is a wasteful number, since it uses less digits than its factorization.

1281366242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41093.

The product of its digits is 27648, while the sum is 35.

The square root of 1281366242 is about 35796.1763600528. The cubic root of 1281366242 is about 1086.1532167069.

The spelling of 1281366242 in words is "one billion, two hundred eighty-one million, three hundred sixty-six thousand, two hundred forty-two".